X0 (9-speed):~ ESP compatible (1:1 actuation ratio) for ESP trigger or twist shifters. Di.R.T (Direct Route Technology) for light-effort shifting performance. Forged alloy links and B-knuckle with Grilonª composite P-knuckle. Titanium hardware and parallelogram return spring. Heat-treated, oversized pivot pins and sealed cartridge bearing pulleys. Carbon fiber outer cage with alloy inner cage (all models). 8, 9-speed compatible with top-normal resting position. Short 192g / Medium 197g / Long 203g.